As a Product Manager for Tesla's "Sales & Delivery" app, I would focus on several key metrics for success. Primarily, in terms of sales, the conversion rate would be a critical measure to evaluate. We could analyze this in more detail by examining metrics such as the time taken from app download to the first purchase, as well as the average value of customer purchases. On the delivery front, it would be important to monitor metrics including the on-time delivery rate and the cancellation rate . Ensuring timely deliveries while keeping a low cancellation rate is essential to build customer trust in our service. Moreover, since customer satisfaction is vital, we should consider engagement metrics like daily active users, session duration, retention rate, and churn rate. Additionally, conducting specific customer feedback surveys such as the Net Promoter Score (NPS) can offer valuable insights to enhance the app. Lastly, given Tesla's commitment to innovation, we would also want to track the usage of any unique features we offer, such as the ability to schedule charging sessions or track vehicle location.